It's short and fun, with a level of production value rarely seen for a game in this scope. It would be fun to add a survival mode for those who wants to chill out and build their city until the world ends.
Thanks for the kinds words! I was planning to add in a couple more victory conditions beyond the "destroy all high-level lairs" for the Steam release - maybe something like "survive for 20 minutes against waves of monsters". This makes me think I should add a Sandbox mode too, where the player can just chill and build, and spawn enemy waves / lairs when they want to.